Overview: What are warts?
The information in this section has been gathered from existing peer-reviewed and other literature and has been reviewed by expert dermatologists on the CSPA Medical Advisory Board.
Warts are small growths on the skin caused by the human papillomavirus (HPV). This virus invades skin cells and enters a resting period, called latency, that may last for months or years. During latency, the virus multiplies and invades additional cells, which then take on the appearance of warts. Although over 100 strains of HPV can infect any part of the body, certain strains tend to infect specific areas of the skin. There are six primary types of warts:
Warts are contagious and can spread through direct and indirect contact. Common warts are spread through activities such as nail biting, whereas plantar warts are often picked up from wet surfaces, such as shower stall floors and swimming pool decks. Flat warts are usually spread by shaving, and genital warts, which are highly contagious, are spread through sexual activity.
HPV infections can sometimes occur along with other uncommon disorders, such as epithelial hyperplasia (Heck’s disease), epidermodysplasia verruciformis or plantar cysts. Some strains of genital warts have the potential to cause cancer of the cervix, vulva, penis and anus.
Although warts frequently recur after treatment, many will disappear spontaneously within two to three years.
Non-genital warts: Genital warts: